Slab-barker.



H. GUETTLER.

SLAB BARKER. APPucATloN FILED 111111.11. 191e. RENwED MAY 15.1918.

1,289,114271 Patented 1160.311918.

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INI/ENTOR TEII QiiilATEg IIENT FFIQE.

HERBERT GUETILER, 0F CHICAGO, ILLINOIS, ASSIG-NOR T0 AMERICAN BARKING DRUM COMPANY, 0F CHICAGO, ILLINOIS, A CORPGRA'IION 0F ILLINOIS.

SLAB-BAKKER.

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Specification of Letters Patent.

Patented Dec. 3l, i918..

Application led March 11, 1916, Serial No. 83,457. Renewed May 15, 1918. Serial No. 234,777.

To all whom it may concern.'

Be it known that I, HERBERT GUE'I'L'LER, a subject of the King of Norway, residing at Chicago, county of Cook, State of Ilhnois, have invented certain new and useful Improvements in Slab-Barkers; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

It is possible to remove A:bark from logs or blocks of wood preparatory to use of the wood in the paper making industry by tumbling the logs or blocks in a rotating drum which preferablyis partially immersed in water held in a suitable tank. rI`he bark thus removed from the wood may be allowed to escape from the drum through longitudinal slots in the drum.

It has not heretofore been considered feasible to bark slabs and edgings in such a device because such thin pieces will work themselves into the slots of the drum as ordinarily arranged and thereby close up the slots, and in some instances, the slabs or edgings may project through the slots far enough to strike against the walls of the tank or the driving mechanism, or otherwise interfere with free rotation of the drum.

It is the object of the present invention to provide a wood barkin drum of special construction so arranged t at while the separated bark may escape freely from the drum through longitudinal slots, these slots are so protected that the wood under treatment will not close the slots and will not work out through them, even though the wood be in the form of relatively thin slabs and edgings.

To accomplish this object, I build up the cylindrical wall of the drum out of strips or angle bars, or the like, so arranged as to overhang the slots between adjacent bars, thereby forming a slot through which the bark may freely escape and yet into which the slabs and edgings will not enter.

The details of the invention are made clear by the following description, which is to he taken in conjunction with the accompanying drawings, wherein- Figure 1 is a side elevation of the drum mounted for rotation in a tank of water;

I*` ig. 2 is a sectional elevation on the line 2-2 of Ifig. I;

Fig. 3 is a fragmentary section through the angle bars forming the cylindrical wall of the drum; and

Figs. 4 and 5 are details of a modified form of construction.

In the embodiment illustrated, the tank l is formed of concrete with a semi-cylindrical chamber for holding water and with an adjustable dam 2, formed by removable flash boards fitted into grooves in the cement tank, whereby the level of the water may be regulated. Mounted on this concrete tank is a framework 3 carrying a drive shaft 4, and counter-shafts 5 carrying sprocket wheels 6 and 7 respectively, over which are passed driving and supporting chains 8, of which three may be used for sustaining the drum in the tank and substantially concentric with the body of water contained therein.

Wood to be barked may enter one end of the drum through a chute 9, and after being tumbled in the drum, may iind exit through a chute 10 leadin to an endless conveyer 11, whereby the bar ed wood may be carried away for further treatment.

rIhe ends of the drum are closed by stationary planks supported in guideways formed in the end'membersof frame 3, as indicated in dotted lines at 12 (Fig. l), and the height of the wood pile within the drum may be regulated by raising or lowering the height of this end wall as by adding additional boards or taking away the topmost boards.

The drum itself, and it is to this that my present invention particularly relates, comprises a plurality of hanged rings 13, of which four are illustrated in Fig. 1, and a plurality of smooth rings 14 (Fig. 2), over which the three driving and supporting chains 8 may pass, and a pair of guide rings 15 (Fig. l), which are embraced by the Hanged guide rollers 16 (Fig. 2), whereby the drum is prevented from swinging or jumping in the tank.

'Ihe cylindrical wall of the drum is made bark can nd a ready exit through the slots when the drum is rotated in the direction indicated by the arrow (Fig. 3), the slabs and edgings do not find a ready exit through the slots and merely slide over from one bar to the next, the wood pile iinally assuming the inclined relation indicated in Fig. 2, and the pieces of woodl sliding and cascading down the face of thepile and thereby rubbing on one another until their bark is removed.

The operation of barking is continuous, for the bark delivered through the slots into the semi-cylindrical and'concentric tank is continuously swept therefrom by perforated or fork-shaped lflights or paddles 19 carried by the drum, and is delivered over dam 2 into compartment 20, and the slabs and edgings continuously supplied through chute 9 progressively work their way through the drum and are discharged down chute 10 to conveyer 11.

In the modification illustrated in Figs. 4 and 5 the bars have their flanges 21 at right angles to their webs 22, and the desired overhang for the slots is secured by inserting wedges 23 between the web of each bar and the adjacent web 24 of the encircling rings, thereby tilting these bars inward at their forward edges and backward at their trailing edges, and so covering up the bark-discharging slot to the extent necessary to prevent the slabs from stopping up the slots or projecting through to the outside of the 4While this arrangement of the drum is of particular value in handling thin pieces of wood, as above indicated, it offers some advantage for use on blocks and logs of the size and type now commonly barked in rotatin drums, as will be understood by those s illed in the art.

I claim:

1. A barking drum for slabs having longitudinal slots for the escape of bark, and baffles overhanging said slots 0n their advancingl edges only to prevent the slabs from protruding or escaping at the slots while permitting free escape of the bark.

2. A barking drum for slabs comprising rings connected by bars with spaces therebetween through which bark may escape, said bars having their trailing edges spaced from said rings and overhanging said slots on their advancing edges only, substantially as described.

3. A barking drum comprising rings connected by angle bars, with slots between the bars through which bark may escape, the flanges of said angle bars extending inward to tumble the wood to be barked and the trailin edge of each angle bar overhanging the adJacent slot to prevent thin pieces of wood from protruding or escaping at said slot, the advancing edges of said bars being exposed. 4. A barkin drum for slabs comprising rings connectegl by angle bars, with slots between the bars through which vbark may escape, the flanges of said bars extending inward to form baffles to tumble the wood to be barked, and being disposed at such an' angle to their respective webs that the anges may overhan rearwardly and substantially cover sai slots to prevent the slabs from protrudin or escaping' therethrough, said slots eing otherwise uncovered; substantially as described.

1n testimony whereof I aiix my signature.

' RBERT GUETTLER. 

